获取最后插入的ID

Question

I am implementing an auto save feature which saves every minute on a form that is being edited or created.

I am doing an insert of a null value beforehand in an auto-incremented db table. From here after the null insert, I need to retrieve the id that was inserted so that I can update off of that ID. How Can I go along of getting this ID with the code I have provided?

I have tried using mysqli_insert_id as shown below, but no luck.

// insert null into database to create the save point
if ($stmt = $mysqli->prepare("INSERT INTO test_table (name, email, notes) VALUES ('x', 'x', 'x')"))
{
    $stmt->execute();
    $stmt->close();
}
// show an error if the query has an error
else
{
    echo "ERROR: Could not prepare Auto-Save SQL statement.";
}

//GET LAST ID
printf("Last inserted record has id %d\n", mysqli_insert_id());

Answer 1

Posting as a community wiki .

printf ("New Record has id %d.\n", mysqli_insert_id($mysqli));

You didn't pass your db connection to it.

Reference:

• http://php.net/manual/en/mysqli.insert-id.php

Object oriented style

mixed $mysqli->insert_id;

Procedural style

mixed mysqli_insert_id ( mysqli $link )

Answer 2

//this query will get the auto increment value of the specific table

SELECT `AUTO_INCREMENT`
FROM  INFORMATION_SCHEMA.TABLES
WHERE TABLE_SCHEMA = 'dbname'
AND   TABLE_NAME   = 'tblname';